Door-strap clamp



Dep', 30, 1930. A. F. PAUL DOOR STRAP CLAMP Filed June 7 16, 1926 2 Sheets-Sheet 1 RM Y. m wm M 0 LS I FA m 5 m 4U 58 n 4 Y B Dec. 30, 1930. A. F. PAUL 1,787,017

DOOR STRAP CLAMP Filed June 16, 1926 2 Sheets-Sheet 2 A P\K I i (.9 S W1 /f 7a. Z

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INVENTOR Abram 5 1g Y Hal Jan 4 P /7/6 A TORNEY Patented Dec. 30, 1930.

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ABRAMF ANK PAUII, or UPPER, IBAEBY BRANCH, EI-IiLADELJPIiIA, PENNSYLVANIA, 'ASSIGNOB T0 NA'rroNnL PNEUMATICCOMPANY,'QF NIZEH'YORK, Y., A CORPORA- TION or wEs'r" VIRGINIA DOOR-STRAP oLAMr Applicationfiled June 16, 1926. Serial No. 116,252.

This invention relates to improvements in means for attaching the doors of vehicles to their operating shafts. V

One of the objects of this invention is the 5 construction of a clamping device for mounting doors on their operating shafts which is simple and easy to construct and cheap in its manufacture and which may be readily replaced in case of breakage.

Another object of this invention is the construction of a strap clamp which is readily adjustable on the door shaft to provide for ease in correctly mounting doors'on their operating shafts.

Another object of this invention is the construction of a door strap clamp which has a large bearing surface on the door operating shaft so as to provide a device which is not easily gotten out of adjustment. A still further object of this invention is the construction of a door strap for mounting doors on their operatingshafts which comprises a serrated wedge member and in place.

This Invention resldes substantially in the construction, combination, arrangement and relative location of parts, all as will be more.

vational View of a portion of a door shaft and the door with my novel clamping strap;

Fig. 2 is a horizontal cross sectional view taken through the center of the clamping nut at Fig. 1;

Fig. 3 is a side elevational view of the" elevational View of. the

F means for adjustably clamping the wedge.

may be secured.

Fig. 7 is an enlarged side elevational View ofthe tapered clamping bolt; and,

Fig. 8 is a side elevational view of the nut used in conjunction with the clamping bolt.

It'has been common heretofore to mount the doors of railway vehicles on a vertical rotatable shaft by meansof'which the doors may be opened and closed. It has been common in former constructions to secure the door to the operating shaft by means of U- shaped metal pieces known in the art as door straps. These straps have been secured to the operating shaft by means of tapered pins but it has been found that in every day use,

the pins have worn in their sockets. and the doors became loose on theope'rating'shafts and were thus thrown out of alignment.

. Other disadvantages of this construction,

were the rattling caused by theloosening of the pins in their sockets. In assembling structure of this type itv was necessary to actually measure and then drill the operating shaft to receive the tapered'pins and if, for any reason, the work was inaccurately laid out, it meant that the work must be done over again. i

These disadvantages have been overcome in my novel construction by means of which the doors may be readily securedto their operating shafts by merely' clamping the straps to the shaft at the desired place. The construction is such that when. once clamped in place, the doors cannot, ordinarily, move either longitudinally orcircun'iferentially with respect to th operating shafts. However, in theadvent of any-suchundesired movement, quick, and cheap readjustment Referringto Figsl to at, the operating shaft is shown at 1, around which fits the U- shapedstrap' member 2 between the arms of which is secured the door 3 by means of bolts 9. Extending across the strap through holes inthe" walls thereof is a frusto-conical shaped thiinble 6 whiclris internally threaded to receive the threaded bolt 5. fMounted between the shaft 1 and thisthimble is a wedge memher 4 havingits surface adjacentthe shaft l concaved and-having its other face trans versely'inclined'so as to cooperate with the frusto-conical thimble 6. As shown in Fig.

' 3, the sides of the wedge are serrated as at 8 bolts 9 are disclosed for clamping the door within the arms of the door strap. Iii-this construction the means of nesting or seeding the shaft 1 within the strap has been somewhat modified. Extending through holes in the walls of the strap 2, is the bolt 10. having a frusto-conical shank below the head in which are formed a plurality of serrations 11. A threaded integral portionlQ is :provided for cooperation with the nut 13 which also has a frusto-conical shaft with circumferential serrations 1 1 and which is internally threaded as at 15. It will be seen that as the nut 13 is drawn up the serrations 11 will bite into the shaft 1 as will the serrations 14% on the nut.

' Itiwill be evident from these construct-ions that the clamping means having two direcdo not, of course intend to be limited to this tional serrations, the movement of the strap withrespect to the shaft, either longitudinally or circumferentially is'prevented. The serrations 7 engage the door shaft and prevent longitudinal movement of the wedge member and hence of the strap on the shaft. It will also be clear that the door may be quickly and easily clamped at any desired point on the operating shaft and without fear of its displacement. 7

While I have disclosed the/use of this clamp in connection with folding doors to be mounted on operating shafts in vehicles, I

to my invention as .it is defined in the appended claims.

"What I seek to secure United States Letters Patent is:

- 1. In combination with a shaft andja strap, a tapered member channeled on one side to fit said shaft and havingvertical serrations in said channel and horizontal serrations on the sides adjacent said channeled side and means to clamp said shaft, tapered member and. strap together. s

2. In ombination with a shaft and a strap, a tapered member channeled on one side to fit said shaft. and having vertical serrationsv in, said channeland horizontal serrations on the sidesadj acent said channeled side, a cone shaped thimble bearing against said tapered member and means to cause said cone shaped member to force said tapered member against the shaft, said thimble and means beingrsecured inholes in said strap.

-3..The combination of a U-shaped strap with a shaft nested within said strap, gripping means having two sets of serrations extending at an angle to each other, one set of said serrations engaging said shaft and the other set engaging 'said strap, and adjustable means mounted on the strap and arranged for engaging said gripping means to force it firmly against the shaft, so that one set of serrations thereof willbite into the shaft'andthe other set of serrations will engage the strap toprevent longitudinal and rotational movement the strap with respect to the shaft.

In testimonywhereof I have hereunto set my hand on this 10th day of June, A. D. 1926 r ABRAM FRANK PAUL. 

